import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Scanner; public class Main { public static void main(String[] args) throws IOException { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); if(str.startsWith("0x")){ str = str.substring(2); System.out.println(Integer.valueOf(str,16).toString()); } } } 不香吗？